CVE-2021-26712
Estado: ModificadaAlta (7.5)—
Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0 and Certified Asterisk 16.8-cert5 allow a remote unauthenticated attacker to prematurely terminate secure calls by replaying SRTP packets.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 7.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 3.63%
- Percentil entre todas las CVEs puntuadas: 89
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (2)
CWE
- NVD-CWE-Other
Referencias
- http://packetstormsecurity.com/files/161473/Asterisk-Project-Security-Advisory-AST-2021-003.html
- http://seclists.org/fulldisclosure/2021/Feb/59
- https://downloads.asterisk.org/pub/security/
- https://downloads.asterisk.org/pub/security/AST-2021-003.html
- https://issues.asterisk.org/jira/browse/ASTERISK-29260
- http://packetstormsecurity.com/files/161473/Asterisk-Project-Security-Advisory-AST-2021-003.html
- http://seclists.org/fulldisclosure/2021/Feb/59
- https://downloads.asterisk.org/pub/security/
- https://downloads.asterisk.org/pub/security/AST-2021-003.html
- https://issues.asterisk.org/jira/browse/ASTERISK-29260
JSON original (NVD)
Mostrar
{
"id": "CVE-2021-26712",
"cveTags": [],
"metrics": {
"cvssMetricV2": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"version": "2.0",
"baseScore": 5,
"accessVector": "NETWORK",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
"authentication": "NONE",
"integrityImpact": "NONE",
"accessComplexity": "LOW",
"availabilityImpact": "PARTIAL",
"confidentialityImpact": "NONE"
},
"acInsufInfo": false,
"impactScore": 2.9,
"baseSeverity": "MEDIUM",
"obtainAllPrivilege": false,
"exploitabilityScore": 10,
"obtainUserPrivilege": false,
"obtainOtherPrivilege": false,
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.5,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 3.9
}
]
},
"affected": [
{
"source": "cve@mitre.org",
"affectedData": [
{
"vendor": "n/a",
"product": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
]
}
],
"published": "2021-02-18T21:15:11.447",
"references": [
{
"url": "http://packetstormsecurity.com/files/161473/Asterisk-Project-Security-Advisory-AST-2021-003.html",
"tags": [
"Third Party Advisory"
],
"source": "cve@mitre.org"
},
{
"url": "http://seclists.org/fulldisclosure/2021/Feb/59",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"source": "cve@mitre.org"
},
{
"url": "https://downloads.asterisk.org/pub/security/",
"tags": [
"Vendor Advisory"
],
"source": "cve@mitre.org"
},
{
"url": "https://downloads.asterisk.org/pub/security/AST-2021-003.html",
"tags": [
"Vendor Advisory"
],
"source": "cve@mitre.org"
},
{
"url": "https://issues.asterisk.org/jira/browse/ASTERISK-29260",
"tags": [
"Issue Tracking",
"Patch",
"Vendor Advisory"
],
"source": "cve@mitre.org"
},
{
"url": "http://packetstormsecurity.com/files/161473/Asterisk-Project-Security-Advisory-AST-2021-003.html",
"tags": [
"Third Party Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "http://seclists.org/fulldisclosure/2021/Feb/59",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://downloads.asterisk.org/pub/security/",
"tags": [
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://downloads.asterisk.org/pub/security/AST-2021-003.html",
"tags": [
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://issues.asterisk.org/jira/browse/ASTERISK-29260",
"tags": [
"Issue Tracking",
"Patch",
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "NVD-CWE-Other"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0 and Certified Asterisk 16.8-cert5 allow a remote unauthenticated attacker to prematurely terminate secure calls by replaying SRTP packets."
},
{
"lang": "es",
"value": "Los controles de acceso incorrectos en el archivo res_srtp.c en Sangoma Asterisk versiones 13.38.1, 16.16.0, 17.9.1 y 18.2.0 y Certified Asterisk 16.8-cert5, permite a un atacante remoto no autenticado finalizar prematuramente llamadas seguras al reproducir paquetes SRTP"
}
],
"lastModified": "2026-06-17T03:43:42.333",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "DA727A7F-D350-450F-BF24-9E6D45FA6930",
"versionEndIncluding": "13.38.2",
"versionStartIncluding": "13.0.0"
},
{
"criteria": "cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "7382B641-0396-456F-BF33-3F6412E35F2D",
"versionEndExcluding": "16.16.1",
"versionStartIncluding": "16.0.0"
},
{
"criteria": "cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "C5BA8606-ADA9-4841-A7E2-A9165138849A",
"versionEndExcluding": "17.9.2",
"versionStartIncluding": "17.0.0"
},
{
"criteria": "cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "F10CB148-DF9C-4134-A417-3B111C036E20",
"versionEndExcluding": "18.2.1",
"versionStartIncluding": "18.0"
},
{
"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:-:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "81C3E390-8B99-4EB8-82DD-02893611209A"
},
{
"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc1:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "17DB2297-1908-4F87-8046-2BAA74569D71"
},
{
"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc2:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "CEA2CC40-C2F6-4828-82F0-1B50D3E61F77"
},
{
"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc3:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "32F19F43-C1E8-4B6C-9356-AF355B7320BD"
},
{
"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc4:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "21D1FA32-B441-485F-8AE9-F3A394626909"
},
{
"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert2:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "F7795CCF-B160-4B4F-9529-1192C11D7FDB"
},
{
"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert3:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "0C5E5D0D-9EB3-40FD-8B7E-E93A95D07AB1"
},
{
"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert4:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "C7DFDA30-DD61-4BBC-AFE4-448BF2A4F303"
},
{
"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc1:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "142F1F89-49AC-4A0B-A273-61F697063A5A"
},
{
"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc2:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "53041795-788C-4914-A2F6-41539ABE0244"
},
{
"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc3:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "FBB98E65-B2D0-49A4-8BF3-12155E3E13C9"
},
{
"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc4:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "769C854C-03CD-40A9-B39B-C0CDCA8252EA"
},
{
"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert5:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "6D86AD6E-4E07-48B0-88D8-E18F277FFE6A"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "cve@mitre.org"
}